Doublet

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Doublet is:

a Doublet (clothing), a man's snug-fitting buttoned jacket that was worn in medieval and Tudor times
a Doublet (lapidary), a fake gem composed in two sections, such as a garnet overlaying green glass
a Doublet (lens), a type of lens, made up of two stacked layers with different refractive indices
a Doublet (linguistics), one of two or more words of the same language that come from the same root
a Doublet (physics), a quantum state of a system with a spin of 1/2
a derivative of the Dirac delta function